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About Rafal Borowiec

Rafal is an IT specialist with about 8 years of commercial experience, specializing in software testing and quality assurance, software development, project management and team leadership. He is currently holding a position of a Team Leader at Goyello where he is mainly responsible for building and managing teams of professional developers and testers. He is also responsible for maintaining relations with customers and acquiring new ones, mainly through consultancy. He believes in Agile project management and he is a big fan of technology, especially Java related (but not limited too). He likes sharing knowledge about software development and practices, through his blog (blog.codeleak.pl) and Twitter (@kolorobot) but also on internal and external events like conferences or workshops.

Spring 4: @DateTimeFormat with Java 8 Date-Time API

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@DateTimeFormat annotation that was introduced in Spring 3.0 as a part of Formatter SPI can be used to to parse and print localized field values in web applications. In Spring 4.0, @DateTimeFormat annotation can be used with Java 8 Date-Time API (java.time) out-of-the-box, without extra effort.

In Spring, field formatting can be configured by field type or annotation. To bind an annotation to a formatter AnnotationFormatterFactory must be implemented. Spring 4.0 brings Jsr310DateTimeFormatAnnotationFormatterFactory that formats Java 8 Date-Time fields annotated with the @DateTimeFormat. Supported field types are as follows:

  • java.util.LocalDate
  • java.util.LocalTime
  • java.util.LocalDateTime
  • java.util.ZonedDateTime
  • java.util.OffsetDateTime
  • java.util.OffsetTime

One can utilize all mentioned types in a form like below:

public class DatesForm {

    @DateTimeFormat(iso = ISO.DATE)
    private LocalDate localDate;

    @DateTimeFormat(iso = ISO.TIME)
    private LocalTime localTime;

    @DateTimeFormat(iso = ISO.TIME)
    private OffsetTime offsetTime;

    @DateTimeFormat(iso = ISO.DATE_TIME)
    private LocalDateTime localDateTime;

    @DateTimeFormat(iso = ISO.DATE_TIME)
    private ZonedDateTime zonedDateTime;

    @DateTimeFormat(iso = ISO.DATE_TIME)
    private OffsetDateTime offsetDateTime;
    
}

The form can be passed to the view and Spring will take care of proper formatting of the fields.

datetimeformat-spring-4-java-8-1

While specifying the formatting on the fields of types: java.util.LocalDate, java.util.LocalTime, java.util.OffsetTime you need to remember to properly configure @DateTimeFormat.

@DateTimeFormat declares that a field should be formatted as a date time and since java.util.LocalDate represents a date, and the other two represent time – you will get java.time.temporal.UnsupportedTemporalTypeException (e.g.: Unsupported field: ClockHourOfAmPm, Unsupported field: MonthOfYear) thrown by java.time.format.DateTimeFormatter.

Reference: Spring 4: @DateTimeFormat with Java 8 Date-Time API from our JCG partner Rafal Borowiec at the Codeleak.pl blog.

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